Biology 2244A/B Chapter Notes - Chapter 11: Null Hypothesis, F-Distribution, Test Statistic
15 Mar 2015
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Testing for equality of three or more population means. H0: 1 = 2 = 3 = 4. Ha: at least one mean is different form the others. Lower confidence level: risk of error too high. Not symmetric skewed to the right. Values of f can be 0 or positive cannot be negative. Different f distribution for each pair of degrees of freedom for the numerator and denominator. Anova: based on comparison of two different estimates of the variance common to different populations. Estimates: variance between samples & variance within samples. Used because sample data are separated into groups according to one characteristic: one-way one factor, two-way. Compare populations separated in categories using two characteristics. Small p-value (0. 05 or less) leads to rejection of null hypothesis of equal means. Large p-value (greater than 0. 05) fail to reject null hypothesis. Requirements: specific values of the factor that we actually use in our experiment, ex.
